The studio launched its own weekly magazine, called Tom Poes Weekblad, in 1947. With writer Ansje Herblot, Van de Weert created a comic strip of his own for this magazine, 'Marco Polo'. It ran in Tom Poes Weekblad from 1948 to 1949, and was continued halfway by Gerard van Straaten. Cees van de Weert additionally made illustrations for books by A.D. Hildebrand under the pen name Hans Geerlag ('Joessoef, het knechtje van de sultan' and 'Met Lodewijk in de zak', both from 1950).

Van de Weert left the Toonder Studios in June 1961, and started his own studio at the Herengracht in Amsterdam, called Studio '62. He continued his career as a graphic designer in the toy production field (in which capacity he also participated in the production of a 'Tom Poes' board game). According to Marten Toonder's biography by Wim Hazeu (2012), Toonder saw Cees van de Weert as one of his most loyal co-workers. After Van de Weert had left, Toonder felt that an essential part of the studios was gone. This was one of the reasons why Toonder gradually distanced himself from the daily routine in the studios and eventually moved to Ireland in 1965. Cees van de Weert passed away in Amsterdam in 1981.